What Is a Rate Lock — And When Should You Lock Your Mortgage Rate?

What Is a Rate Lock — And When Should You Lock Your Mortgage Rate?

Interest rates move.

Sometimes daily.
Sometimes hourly.

That’s why understanding a rate lock matters.

Let’s break it down clearly.

What Is a Rate Lock?

A rate lock is an agreement between you and your lender that guarantees your interest rate for a specific period of time.

Once locked:

Your rate does not change — even if market rates rise.

That protection lasts for a defined window, typically:

• 30 days
• 45 days
• 60 days

Depending on your loan timeline.

Why Rate Locks Matter

Mortgage rates are influenced by:

• Bond markets
• Inflation data
• Federal Reserve policy
• Economic reports

You cannot control those factors.

But you can control whether you protect your rate once it’s available.

A rate lock removes uncertainty.

When Should You Lock Your Rate?

There isn’t one universal answer.

But generally, you should consider locking when:

• You are under contract
• Your loan is approved or close to approval
• The market is volatile
• You’re comfortable with the current payment

Waiting for rates to drop is speculation.

Locking is risk management.

What Happens If Rates Drop After You Lock?

This depends on your lender.

Some lenders offer a “float-down” option.
Some do not.

A float-down allows you to adjust to a lower rate if the market improves — but it usually has conditions.

It’s important to understand your lender’s policy before locking.

What Happens If You Don’t Lock?

If you float your rate and:

• Rates increase
  Your payment increases.

Even a 0.25% change can impact monthly payment and long-term interest paid.

Rates don’t need to move dramatically to matter.

How Long Can You Lock a Rate?

Standard lock periods are:

• 30 days (most common)
• 45 days
• 60 days

Longer locks are possible but may cost more.

The goal is to match your lock period to your expected closing date.

The Bottom Line

A rate lock is not about predicting the market.

It’s about protecting your budget.

When we discuss rate strategy, we look at:

• Your contract timeline
• Market conditions
• Your comfort level
• Your financial goals

Then we make a decision based on structure — not emotion.